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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ce69ab146e6d55d532a1b2197e20386dd29cde20ffce8b3b693f31d0d847e7a' 
  AND token = 'sVzp8KbSFoPSDv1OPM0EjLKQL6NWQtTrhoyTPS23R44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}